Emil eye



E. RYE. MODE or PRODUCING LITHOGRAPHIG corms FROM PHOTOGRAPHIGNEGATIVES.

No. 109,551. Patented Nov. 22, 1870.

UNITED STATES PATENT OFFICE.

EMIL RYE, OF COPENHAGEN, DENMARK.

IMPROVEMENT IN-THE MODE OF PRODUClNG LITHOGRAPHIC COPiES FROMPHOTOGRAPHlC NEGATIVES.

Specification forming part of Letters Patent No. 109,551, dated November22, 1870.

To all whom it may concern: Be it known that I, EMIL RYE, of Copenhagen,in the State of Denmark, have invented a new and useful Improvement inthe manner clear, and exact representation of my-invention, referencebeing bad tothe accompanying drawing making a partof this specification,inwhich- Figure l-represents a perspective view of a drying apparatus,and Fig. 2 is a perspective view of a ciosed vessel provided withperforations or recesses.

' .The nature of my invention consists in the preparation of a platemade of glass, porcelain, zinc, or other suitable material, which, afterhaving undergonea chemical process, the picture from a photographicnegative is transferred, and permanently secured in the coating whichcovers said plate, and as many lithographic copies as desired Inav beprinted from it.

To enable others skilled in the art to make anduse my invention, 'I willdescribe its construction and operation.

The plate from which the lithographic copies are taken consists ofglass, porcelain, zinc, or any other suitable material, and is preparedin the following manner: When the print-plate consists of glass, (groundglass is preferable,) its surface is polished very smoothly, thor oughlycleaned, and then provided with a coat of the white of an egg, and driedin the drying apparatus A. This apparatus consists of arectangular-formed closed vessel, forming the bottom, and resting onfour legs. Immediately above it, and at each corner of the vessel, is avertical standard of about one foot in height, secured to the top plateof the vessel B. Between these four corner-posts canvas or othersuitable colored fabric is suspended in such manner'that a perfectlyinclosed space is formed, which serves as an owner drying- -p1ace, fromwhich light is partly and dust entirely excluded. A door, A, is providedat one of the sides of the drying-place, and

hinged to the vessel 3 at A., The bottom part or vessel B serves as aresting place for the plates to be dried; and in order to secure anequal temperature the vessel is Iilled with water, introduced throughpipe'U. Through the pipe D water may be drawn from the vessel B, and theheat is communicated through a lamp or other device placed below tuevessel B. When the Water has been introduced, a glass tube, 0, and theIndia-r11 bber tube U, is secured to the induction-pipe (3, throughwhich the steam passes into the receptacle in.

In order to keep the water contained in the vessel B at about the sametemperature, a.

- thermometer may be attached at some convcuient place.

Fig. 2 shows a perspective view of a closed vessel, G, into whichbottles, 850., may be placed. Under the vessel G- a lamp is placed, inorder to heat the water contained in said A thermometer, G", is attachedatperformed, the print-plate'is again made wet with a solutionconsisting of the following ingredients: Water, ichthyocolla,'whitcsugar, chromate of ammonia, albumen, and ox-gall; to this compositionadd lupuliu, myrrh, benzoe, and tolu-balsam dissolved in spirit vini,and further add some drops of a composition consisting of iodide ofcadmium, bromide of cadmium, and water. The print-plate is then dried inthe inclosure A, and is now ready to receive the impression from thephotographic negative.

The process of transferring the picture from the negative to theprint-plate is performed in the usualmanner, by the agency of light. Theprint-plate is then submerged in water till the greater parts of thechrom-salts are. abstracted, and when'it has become dry again it isready for printing. When the printing process is to ing-roller, providedwith the commonly-used lithographic ink, which is mixed with varnish orcopa-iva. balsam. -Any lithographic press and any kind of paper may beused.

WVhen the operator desires to employ printplates consisting of metalsheets, zinz ought to have the preference, it being the cheapest,

and, easiest to treat. The zinc print-plate is first provided with awell-polished surface, and then corroded with a solution of one partchrom-acid and forty or fifty parts of water;

then washed in cold water, and. a solution of from one to ten parts ofichthyocolla poured over it. Only in this preliminary working it isdifferent from the process which the glass print-plate undergoes. Thewhole time re quired to prepare a print-plate will amount to about oneor two hours.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

1. The herein-described process'for covering plates with plane andsmooth surfaces with a preliminary coating prepared with chrom-acid, onwhich the picture from a photograph negative may be transferred andsecured, and then serve as a print-plate from which lithographic copiesmay be taken,substantially as and for the purpose set forth.

2. The combination and arrangement of the drying apparatus, consistingof a closed vessel, B, forming the bottom, and provided with pipes O andD, standards A(, the cover A, and the hinged doors A, substantially asdescribed.

3. The combination and arrangement of theclosed vessel G with theapertures G, and thermometer G, substantially as and'for the purpose setforth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

Witnesses:

C. F. OLAUsEN, W. E. BENDZ.

E. RYE.

